Drive mechanism for twister frames



June 11, 1940. R E BERGMANN 2,203,665

DRIVE MECHANISM FOR TWISTER FRAMES Filed Nov. 18, 1958 5 Sheets-Sheet 1 3nventdrs & RICHARD E BERGMANN CLARENCE C. WALTERSM FRED J. SAMERDYKE torteg J1me R. F. BERGMANN 2,203,665

DRIVE MECHANISM FOR TWISTER FRAMES Filed Nov. 18, 1938 3 Sheets-Sheet 2 Jnnentors RICHARD E BERGMANN CLARENCE CVWALTERS Mm F D J-SAMERDYKE attorney Patented, June 11,1940 2,203,665

UNITED STATES PATENT OFFICE 2,203,665 DRIVE MECHANISM FOR rw srm FRAMES Richard FLBergmann, Lakewood, Clarence C. Walters, Cleveland, and Fred J. Samerdyke, Rocky River, Ohio, assignors to Industrial Rayon Corporation, Cleveland, Ohio, a. corporation or Delaware Application Novemberlil, 1938, Serial No. 241,222

26 Claims. (Cl. 57-99) This invention relates to apparatus for driving machine generally similar to that shown, despindles in .twisting apparatus, doubling apparascribed and claimed in copending application Setus, etc., by means of an endless flexible memrialNo. 7,114, filed February 18, 1935, by Walter ber, such as a belt or tape. Theinventionhas F. Knebusch and Alden H. Burkholder. In said particular applicability to means for rotating machine, each thread is subjected after its for- 5 spindles mounted on lifting rails which recipromation to suitable processing treatment on a decate vertically during the, operation 'of the appascending series of thread-advancing thread store ratus; for instance, in the operation of captwistdevices which conveniently take the form of ing apparatus. The invention provides apparathread-advancing reels. Each of said reels is of tus which may be readily adapted to rotate the cantilever form; i e., it is. supported from one 9 spindles in eitherdirection, thus making itpo'ssiend only. On each the thread is advanced toble in twisting apparatus to obtain a' rightor ward the unsupported end of the reel in a pluleft-hand, twist without changing. the direction a rality of generally helical turns, the threadpassof rotation of the drum. ing from the unsupported end of each reel to the 5 Otherfeatures of the inventionwill be apparsupported end of the succeeding reel -On the cut from the followingdescription. i last reel the thread is dried; after which it is Among other things, {the invention provides twisted and collected in package form.

driving apparatus which is of simple and i neirpen- In the drawings appear only the reels 2, on sive construction and which operates very eflis each of which a thread I from the preceding reels cientl y with a minimumfof slip. It further pro is dried and from which it passes through guide vicles apparatus in whichspindles on; opposite 3 to a cap-twister 4.

sides of the apparatus are driven by a singleend- The cap-twisters 4 are mounted on each side less belt from ,a single drivinglmember; c; g. a of the apparatus,being supported by lifting rails drum, disposedbetween the spindles, in which 5 and stationary rails 6. Stationary rails 6 on apparatus the oppositely moving runs 10f the belt both sides of the apparatus are supported by 25 are disposed at points spaced lengthwise, of, the brackets 1 fixed to the vertical fname mem:v

driving member itself. The present invention "bers 8 forming part of the frame of the ma s emp i.. p a Of s type in chine indicated generally as 9. The station: which both runs of thebelt are in contact with ary vertical spindle shafts II on which the caps and driven. by a single drum, asa result of which H of the cap-twisters 4 are mounted are cons O a ned a p u y fii enected at, their lower ends to stationary rails 6.

Fo purposes of illustration, but in no sense of The rotatable whirls l3 of the cap-twisters, which l mitation. the invention will bedescribed in consupport the thread-collectingbobbins H, are renecti n wi h cap-t apparatusemployed in tatably mounted on the lifting rails 5. During v the manufacture of multiple filament viscose aroperation of the cap-twisters, the bobbins H are 85 tificia-l silk thre dby the c ntinuous process. rotated and vertically reciprocated within the Inthe accompanyingdrawings, Figure lshows caps l2 the inventionas embodied in cap-twisti g ap- The lifting rails on opposite sides of the map a us forming e lower p Of a mach ne for chine are rigidly connected by cross members '5. the manufacture of multiple filament viscose arof which one is shown in Figure 2. .Two spaced 4o tificial silk thread, such figure comprisinga sec.- cross members |5,.are usually sufficient for each tiontransversely of the apparatus as a wholepair of opposite lifting rails. The-cross members Figure 2 is a P n Of e ap a a us of u e 1 [5 are slidably supported on stationary guide rods ae-Seen from line 2;! Qf Figure i u 3 s l6, one such guide rod being provided near each an elevation, corresponding generally to that of end of each cross member. The guide rods i6 4 Figure 1, as seen from line 3-3 of Figure 2. are, fixed at their lower endsto beams 1'! carried Figure 4 is a perspective corresponding, substanby the brackets I, while at their upper ends the tially to Figure 3 showing somewhat more clearlv are fixed to brackets l8 connected to a beam Hi the path of the belt. Figure5 is anend elevaforming part of the frame of the machine and ,tion of the apparatusyas seen from line 5- 5 of connected tovertical frame members 8. Figure 2, showing among other things the means Thelifting rails 5 on both sides of the apparafor actuating the lifting rails. In the drawings, tus, being connected together by cross members like reference characters refer to y like parts l5, thus form a substantially rigid frame which throughout; may be reciprocated vertically in the desired The invention is illustrated as embodied in a manner.

from above.

, catory frame. Rod

Corresponding whirls IS on opposite sides of the machine are rotated by belts 2| from a rapidly rotating drum 22 disposed longitudinally of the apparatus between the whirls. The drum 22 rotates about a fixed axis and is mounted on a shaft 23 supported by a frame structure 24 disposed beneath the drum and rigidly fixed to the frame 9 of the machine. Each belt 2| drives four spindles, two on each side of the machine, although it is apparent that more or less spindles may be rotated from a single belt. A plurality of belts may be driven from a common rotating drum, as shown.

It can be seen from Figures 1 to 4, inclusive, and particularly from Figure 4 that the two opposite runs of each endless belt 2| are spaced from each other lengthwise of the drum 22, .one run passing over the drum and the other passing under the drum. The drum is thus enclosed between the runs of the belt. Both runs contact with and are driven from the drum, the relation of the belt to the drum being such that the surface of the drum contacted by each run of the belt is moving in the same direction as the belt. Suitable means, such as rollers or pulleys, are provided in close proximity to the drum to provide a substantial angle of wrap of the belt on the drum and to maintain it during movement 01' the lifting rails.

For the indicated direction of rotation of the drum 22, the belt 2| will travel in the direction shown by the arrows, thus imparting to the spindles a counterclockwise rotation when viewed In the illustrated embodiment of the invention, the run of the belt passing over the drum 22, which run will for convenience be indicated as 25, is urged downward onto drum 22 by means of pulleys 26 and 21 mounted on 0pposite sides of the drum. Pulley 26 is supported by arm 28 mounted on a rod 29 connected by bracket 3| to each cross member l5.

Rod 29, which may extend between and be connected to spaced cross members l of the reciprocatory frame, may conveniently support corresponding pulleys 26 for adjacent belts. Pulley 21 is mounted on the arm nected'to the stationary frame structure 24, as by brackets 34. Rod 33, like rod 29, may extend lengthwise of the apparatus and support corresponding pulleys 21 for adjacent belts.

The other run 35 of the belt 2| passes under driving drum 22, over movably mounted pulley 36, and thence under the pulley 31 as it passes to a whirl I3. Pulley 31 is mounted on arm 38 carried by rod 39 mounted by bracket 40 on cross member l5. As is the case with rod 29 carrying pulleys 26, rod 39 for pulley 31 may extend lengthwise of the apparatus and be supported by the other cross member l5 included in the recipro- 39 may therefore be used to support corresponding pulleys 31 for adjacent belts 2|.

Pulley 36 is designed to maintain a substantially constant tension on belt 2| and to take up slack in the belt during reciprocation of the lifting frame. Thus in the apparatus shown, pulley 36 is mounted on an arm 4| which is pivotally connected to a bracket 42 rigidly fixed to a rod 43 which is rigidly connected to the frame of'the apparatus and which likewise extends lengthwise of the apparatus,-supporting in a similar manner pulleys 36 for other belts. A tension member such as cable 44 passingover sheave 45 mounted on bracket 42 is connected at one end to the pivotally mounted arm 4| supporting pulley 36 and has -trated embodiment of the invention,

lifting rail and is passing toward the 32 carried by rod 33 conup the slack in the connected thereto at the other end a suitable counterweight 46.

Pulleys 26 and 31 for opposite runs of the belt are mounted to move in unison with the lifting rails and in fixed relation with'respect to the plane of the belt starting on the whirls. These pulleys are shown as mounted in fixed relation with respect to the lifting rails 5, although they might be suitably movably mounted thereon to take up slack in the belt without interfering with their guiding function. The pulleys 21 and 36 are supported by the rigid frame of the machine and aid in increasing the angle of wrap of the belt around the driving drum 22. In the illuspulley 26 also performs this function.

The movement of the various portions of the belt 2| and associated apparatus during reciprocation of the lifting rails can be understood by reference to Figures 1 and 4.

Thus when the lifting rails l5 are in the lowermost position, as is shown by full lines in Figure 1, pulleys 26 and 31 serve to guide their respective runs of the belt 25 and 35 onto the whirls l3 toward which the belt is passing, since said pulleys are fixed to and move downward with the lifting rails l5. After the belt leaves the whirls on each drums 22, it is not necessary that it be guided with respect to the whirls, and hence these portions of the runs 25 and 35 of the belt have no guide pulleys mounted on the reciprocatory frame and are upwardly inclined toward the drum. Similar conditions occur when the lifting rail is in the uppermost position, as shown by the dotted lines in Figure 1. In this position the pulleys 26 and 31, being in fixed positions with respect to the whirls l3 to which the belt passes, guide the belt passing to said whirls, while the portions of the runs 25 and 35 leaving the whirls and passing to the driving drum are downwardly inclined toward the driving drum.

During reciprocation of the lifting'rails, therefore, the belt is at all times positively guided as it starts on the whirls and consequently moves in a fixed path'with respect to each whirl toward which it is traveling. Furthermore, during such reciprocation the tension pulley 36 moves to take I belt caused by the reciprocation of the lifting rails, as shown by the positions indicated in full and dotted lines in Figure 3, thus maintaining a substantially constant tension in the belt. The arrangement of the pulleys is such that very little change occurs in the angles of wrap of the two runs of the belt on the drum.

In the illustrated embodiment of the invention,-

there is obtained a substantial degree of wrap of each run of the belt around driving drum 22 as a result of the fact that at least one pulley contacts each of the runs of the belt and causes it to wrap around said driving drum in an open loop in the bight of which is disposed the driving drum itself. By an open loop is meant a loop such that the run of the belt does not cross upon itself in such manner as to enclose the driving drum completely. Since neither run of the belt crosses upon itself, all portions of each run of the belt, whether in contact with or in the immediate vicinity of the drum, are disposed in a. plane perpendicular to theaxis of rotation of the drum,

thus eliminating any bending of the belt in the plane of the belt. Moreover, in the illustrated embodiment of the invention, pulley 36 is dis- To change the direction of rotation of the whirls, the various pulleys 26,. 21, 36 and 31 may be moved lengthwise of the driving drum 22 to positions in which they are in contact with the runs of the same belt opposite from the runs which they originally contacted. This may be accomplished by bodily sliding lengthwise of the drum the various rods 29, 33, 39 and 43 supporting the pulleys and thepulleys supported thereby. This end can be effected by loosening the brackets 3|, 34, 40, etc., which may be designed for this purpose, and clamping said rodsto the cross members I5 or to the frame of the machine, as the case may be.

Furthermore, the runs of the belt should be interchanged with respect to the drum; that is, the run which originally passes over the drum should be passed under the drum and the run which passes under the drum should be passed over the drum. This may readily be accomplished without severing the belt after the belt has been removed from the pulleys so that it is slack, by lifting the belt from the whirls at opposite sides of the apparatus, and turning the belt over bodily so that the runs are interchanged. After the pulleys and the runs of the belt have been thus interchanged, the direction of rotation of the spindles will be changed although the direction of rotation of the driving drum 22 is the same. These and similar changes may be made in only a very few minutes. Referring now to other details of the illustrated apparatus, the reciprocatory frame conprising lifting rails 5 and cross members 15 is moved up and down by means of flexible tension members 41, such as chains, each fastened at one endto one end of the cross members I 5and at the other to a sprocket 48 (Fig. 2) rigidly fixed to a shaft 49 extending longitudinally of the apparatus along each side thereof. Each such shaft 49 may be connected by such tension members 41 to a plurality of cross members l5 disposed at intervals along the length of the apparatus. Each of said shafts 49 may have rigidly connected thereto one or more sprockets 5|, each having connected thereto and adapted to wind therearound a tension member 52 supporting a counterweight 53. The tension members 41 and 52 for each shaft 49 are, as shown, mounted on their corresponding sprockets on'opposite sides of said shaft 49 so that as one unwinds from its sprocket the other winds on its corresponding sprocket. The counterweights 53 serve to counterbalance a portion of 'the weight of the reciprocating parts.

The shaft 49 on the left-hand side of the machine in the-figures is provided at one end with a sprocket 54 (Figs. 2 and 5) having connected thereto and adapted to wind thereabout a tension member 55 which is connected at its other end to a lever 56. One end of lever 56 is connected to said tension member 55 while the other end is pivotally mounted as at 51 on the frame 9 of the machine. In the illustrated embodiment the drive end of the frame 9 of the machine is provided with a housing 58 on which the lever 56 is pivotally mounted and which further rotatably carries a suitably shaped cam likewise rigidly mounted on the back of said housing 58. Motor 63 drives speed reducer 62,

' the shaft housing 58 and to the chain 65 and associated mechanism by removal of cover plate 61. Since the chain 64 and its associated mechanism is contained within the housing member 58, it is adequately protected and lubricated.

, Thus driving drum 22 is rotatedat a high speed while the cam the same motor.

A flexible cross tension member 68 connected at one end to a sprocket 69 on the left-hand shaft 49 and at the other end thereof to a sprocket H connected to the shaft 49 on the right-hand side of the machine, as shown, serves to actuate 49 on the right-hand end of the machine. Therefore the reciprocatory frame and lifting rails on opposite sides of the apparatus forming a part thereof are reciprocated in unison.

' The flexible tension member 68, as well as meming fluid circulated into the interior of the reel through the reel drive shafts 13 by means of supply and return pipes 14 and i5. Thereels are shown as being rotated by means of gears 16 mounted on their respective drive shafts 13 rotated by gears 11 mounted on drive shafts 18. The reels are supported by means of suitable brackets 19 on inclined members 8| forming part of the frame of the illustrated apparatus. The reels 2 and their appurtenant apparatus, however, form no partof the present invention.

The present invention thusprovides spindle driving apparatus particularly adaptable for use in cases in which the spindles are mounted on reciprocatory frames, which apparatus is simple in construction, efficient in operation, and, because it provides a design in which the opposite runs of the belt travel in spaced, substantially parallel planes, minimizes belt wear due to excessive bending of the belt in the plane of the belt. Since both runs of the belt maybe positively driven by the driving drum, belt slip is reduced to aminimum. While the lifting rails on opposite sides of the apparatus are shown as connected together by cross members, it is apparent that this is not strictly necessary, since the lifting rails may be otherwise moved in unison.

The term reciprocatory frame as used in the member; an endless belt passing around said spindles on opposite sides of said driving member enclosing said driving member between opposite runs thereof, each of the opposite runs of said 59 is rotated at a low speed from driving member ing or belt contacting said driving member butpasslng across said driving'member only once; and a pu lley contacting each of said runs of said belt mounted 'tourge said run of said beltagainst said to provide a substantial angle of wrap of said runof said belt on said driving. member. L

2r. Apparatus of the character described in claim 1 in which at least one of said pulleys is movably mountod to maintain a substantially constant tension on said belt.

3. Apparatus for "rotating thespindles of twisting or doubling apparatus comprising a rotatable driving-member; spindles mounted on opposite sides of the axis of rotation of said driv in'g member; anendlcss belt passing-around said spindles onopposite sides of said driving member enclosing said driving member between orppositc runs thereof, both opposite runs'of said belt contacting said driving member at; points spaced lengthwise thereof in such manner that each runpasses only once across said driving member and the surlace'of the driving member contacting each run of the belt moves in the same direction as such run of the belt; and a. pulley contacting each of said runs of said belt mounted to urge said run of said belt against said driving member to provide a substantial angleof wrap ofsaid run of said belt on said driving 30 member.

4-. Apparatus of the character described in claim 3 in which at least one of said pulleys is mounted for restrained movement in response to variations in the tension ,of said belt.-

'5. Apparatus for rotating the spindlesof twisting or doubling apparatus comprising a rotatable driving member; spindles mounted on opposite sides of the axis of rotation of said driving member; an endless belt passing around said. spindles on opposite sides of said driving; member enclosing said driving member between opposite runs thereof. each of the opposite runs of saidbelt contacting said driving member; pulleys mounted on opposite sides of said driving member contacting opposite runs of the belt, each pulley guiding the correspondingrun of the belt to the spindle to which the vbelt'passes from said driving member; and pulleys mounted in close proximity to said driving member contacting opposite runs of the belturging the belt against said driving member to provide a substantial angle of wrap of each run of the belt on said driving member.

6. Apparatus for rotating the spindles of twistdoubling apparatus comprising a rotatable driving member; spindles mounted on opposite sides of the axis of rotation of said driving memberi an endless belt passing around said spindles on opposite sides of said driving .member enclosing. said driving member between opposite runs thereof, each of the runs of said belt contacting said driving member; .but passing across said driving member only once: and one or more pulleys contacting each run of said belt on the side of said belt opposite the side of the belt.

I a rotatable driving member; spindles mounted on opposite sides of the axis of rotation of said driving member; an endless belt passing around said spindles on opposite sides of said driving a ing the other ing member, whereby a substantial angle of wrap of each run of the belt on said driving member is provided.

8. Apparatus for rotating spindles. comprising '7 a rotatable'driving member; spindles mounted on opposite sides of the axis of rotation of said driving member; an endless belt passing around i said spindles on opposite sides of said driving member enclosing said driving member between opposite runs of said belts, both runs ofsaid bclt contacting said driving member; pulleys contacting one of said runs of said bolt on opposite sides of said driving member to urge said run of the belt against the driving member, one of said pulleys guiding the belt onto the spindle to which said run. of the belt passes; and pulleys contactrun of the belt, one of said pulleys guiding the belt onto run of the belt passes and another pulley, forming a bight on said run of the belt between-said first-mentioned pulley contacting said run and said drivingmeans.

9. Apparatus of the character described in claim 8 in which. said last-mentioned pulley is movably mountedt'o maintain a constant tension on said belt.

10. Apparatus for rotatingreciprocatory spindles comprising a stationary frame; a driving member mounted for rotation about anaxis fixed with respect to said stationary frame; a reciprocatory frame associated with said stationary frame; spindles mounted on said reciprocatory frame on opposite sides of the axis of said driving member; an endless belt passing around said spindles on opposite sides of said driving member enclosing said driving member between opposite runs thereof, each of the runs of said belt contacting said driving member but passing across said driving member only once; and pulleys carried by said stationary frame and said reciprocatory frame contacting the opposite runs of said belt and urging said runs of said belt against said driving member, thereby providing a. substantial angle of wrap of each run of the belt on said driving member.

11. Apparatus for rotating reeiproeatory spindles comprising a stationary frame; a driving member mounted for rotation about an axis fixed with respect to said stationary frame; a reciprocatory frame associated with said stationary frame; spindles mounted on said reciprocatory frame on opposite sides of the axis of said drivingmember; an endless belt passing around said spindles on opposite sides of said driving member, bothv opposite runs of said belt. contacting said driving member at points spaced lengthwise thereof in such manner that each run passes only once across said driving member and the surface of the driving member contacting each run of the belt is moving in the same direc tion as such run of the belt; and pulleys'carried by said stationary frame-and said reciprocatory frame contacting the opposite runs of said belt and urging said runs of said belt against said driving member, thereby providing a substantial angle" of wrap of each run of the belt on said driving member.

the spindle to which saidv 12. Apparatus for rotating reciprocatory spindles comprising a stationary frame; a driving member mounted for rotaion about an axis fixed with respect" to said stationary frame; a

reciprocatory frame associated with said stationary frame; spindles mounted on said reciprocatory frame on opposite sides of the axis of said driving member; an endless belt passing around said spindles on opposite sides of said driving member, said endless belt passing in two spaced runs between said spindles in such manner that one of said runs passes over said driving member and the other of said runs passes under said driving member but with both runs of said belt contacting said driving member; and pulleys contacting both runs of said belt in close proximity to said driving member to urge each run of said belt against said driving member, the pulleys contacting at least one of. said runs of said belt being disposed on-opposite sides of said driving member and at least one of said pulleys being mounted on said reciprocatory frame.

13. Apparatus for rotating reciprocatory spindles comprising ,a stationary frame; a driving member mounted for rotation about an axis fixed with respect to saidistationary frame; a reciprocatory frame associated with said stationary frame;spindles'mounted on said reciprocatory frame on opposite sidesl of the axis of said driving member; an endless beltpassing around said spindles on opposite sides or said driving member enclosing said driving member between opposite runs of said belt, one run of said belt passing under said driving member anti the other run of said belt passing over said driving member but both runs of said belt contacting said driving member; and pulleys carried by-asaid stationary frame contacting each run of said belt, said pulleys being mounted so that the belt in the run passing over the driving member passes under one of said pulleys while in the otherrun the belt passing under said driving member passes over another of said pulleys.

14. Apparatus for rotating reciprocatory spin dles comprising a stationary frame; a driving member mounted for rotation about an axis fixed with respect to said stationary frame; a reciprocatory frame associated with said stationary frame; spindles mounted on said reciprocatory frameon opposite sides of the axis of said driving member; an endless belt passing around said spindles on opposite sides of said driving member enclosing said driving member between opposite runs of said belt, one run of said belt passing l and over the driving member; and pulleys mount- ,ed on said reciprocatory frame contacting each run of said belt, each .of said last-mentioned pulleys guiding the belt onto the spindle to which the belt passes.

15. Apparatus of the character described in claim 14 in which at least one of said pulleys is mounted for movement in a predetermined path 1 in response to changes in the tension of the belt.

16. Apparatus for rotating reciprocatory spindles comprising a stationary frame; a driving member mounted for rotation about an axis fixed with respect to said stationary frame; a reciprocatory frame associated with said stationary frame; spindles mounted on said reciprocating frame on opposite sides of the axis of said driving member; an endless belt passing around said spindles on opposite sides of said driving member enclosing saiddriving member between both opposite runs of said belt, both runs of said belt contacting said driving member; pulleys on opposite sides of said driving member contacting one run of said belt to urge it against saiddriving member, one of said pulleys being mounted on said reciprocatory frame and the other of said pulleysbeing. carried by, said stationary member; and pulleys contacting the other run of said belt, one of said pulleys being mounted on the reciprocatory frame and the other pulley being carried by said stationary frame member and forming a bight in the belt between said firstmentioncd pulley contacting said run of the belt and said driving member.

17. Apparatus of the character described in claim 16 in which said last-mentioned pulley carried' by said stationary member is movably mounted to maintain a substantially constant tension in said belt.

18. Apparatus of the character described in claim 16 in which at least one of said pulleys is capable of restrained movement independently of its supporting means to maintain tially constant tension in said belt.

19. Apparatus for rotating reciprocatory spindles comprising a stationary frame; a driving member mounted for rotation about an axis fixed with respect to said stationary frame; a reciprocatory frame associated with said stationary frame; spindles mounted on said reciprocatory frame on opposite sides of the axis of said driving member; an endless belt passing about said spindles on opposite sides of said driving member, both runs of said belt contacting said driving member but with one run of said belt passing over said driving member and the other run of said belt passing under said driving member; a

a substanpulley carried by said reciprocatory frame under which pulley the run of the belt passing over said driving member passes to a spindle; a pulley carried by said stationary frame on the other side of said driving member under which the same run of the belt passes; a pulley carried by said reciprocatory frame contacting the other run of the belt under which pulley the belt passes from said driving member to a spindle; and, carried by said stationary frame, a pulley over which said run of the belt passes between said driving member and said last-mentioned pulley.

20. Apparatus of the character described in claim 19 in which said last-mentioned pulley carried by the stationaryframe is movably mounted to maintain a substantially constant tension in the belt.

21. Apparatus for rotating the spindles of twisting or doubling apparatus comprising a rotatable driving member; spindles mounted on opposite sides of the axis of rotation of said driving member; an endless belt passing around said spindles on opposite sides of said driving member enclosing said driving member between opposite runs of said belt each of which contacts said driving member, all portions of each run in the vicinity of and contacting said driving member lying in a plane perpendicular to the axis of rotation of said driving member; and at least one pulley contacting each of said runs of said belt mounted to urge said run of said belt against said driving member.

ing member to form an open loop in said run in the bight of which said driving member is disposed, whereby said driving member contacts each of said runs of said belt in driving relation.

23. Apparatus for rotating the spindles of twisting or doubling apparatus comprising a rotatable driving member; spindles mounted on opposite sides of the axis of rotation of said driving member; an endless belt passing around said spindles on opposite sides of said driving member enclosing said driving member between opposite runs of said belt each of which runs contacts said driving member in driving relation, said runs being spaced longitudinally of said driving member; and, associated with at least one of the runs of said belt, pulleys mounted on opposite sides of said driving member urging said run of said belt against said driving member, said pulleys being mounted to form an open loop in said run in the bight of which said driving member is disposed.

24. Apparatus for rotating reciprocatory spindles comprising a stationary frame; a driving member mounted for rotation about an axis fixed with respect to said stationary frame; a reciprocatory frame associated with said stationary frame; spindles mounted on said reciprocatory frame on opposite sides of the axis of said driving member; an endless belt passing around said spindles on opposite sides of said driving member enclosing said driving member between opposite runs of said belt each of which contacts said driving member, all portions of each run in the vicinity of and contacting said driving member lying in a plane perpendicular to the axis of rotation of said driving member;

and at least one pulley contacting each of said runs of said belt mounted on one of said frames to urge said run of said belt against said driving member.

25. Apparatus for rotating reciprocatory spindles comprising a stationary frame; a driving member mounted for rotation about an axis fixed with respect to said stationary frame; a reciprocatory frame associated with said stationary frame; spindles mounted on said reciprocatory frame on opposite sides of the axis of said driving member; an endless belt passing around said spindles on opposite sides of said driving member enclosing said driving member between opposite runs of said belt; and, mounted on one of said frames at least one pulley contacting each of said runs of said belt in close proximity to said driving member to form an open loop in said run in the bight of which said driving member is disposed, whereby said driving member contacts each of said runs of said belt in driving relation.

26. Apparatus forrotating reciprocatory spindles comprising a stationary frame; a driving member mounted for rotation about} an'axis fixed with respect to said stationary frame; a'

reciprocatory frame associated with said stationary frame; spindles mounted on said reciprocatory frame on the opposite sides of the axis of said driving member; an endless belt passing around said spindles on opposite sides of said driving member enclosing said driving member between opposite runs of said belt, each of the runs of said belt contacting said driving member; and, associated with at least one of said runs of said belt, pulleys mounted on opposite sides of said driving member urging said run of saidbelt against said driving member, said puileys being mounted to form an open loop in said run in the bight of which said driving member is disposed.

RICHARD F. BERGMANN. CLARENCE C. WALTERS. FRED J. SAMERDYKE. 

